TWI815198B - extraction bag - Google Patents

Abstract

The present invention provides an extraction bag 1A. The extraction bag is an immersion-type extraction bag filled with extraction material in a planar bag body such as a flat bag made of a water-permeable filter sheet, and is provided with a thin plate-shaped material formed in the bag. The specific holding part of the main body defines the characteristics of the water-permeable filter sheet, thereby improving the extraction efficiency. This extraction bag 1A has a bag body 3 formed of a water-permeable filter sheet, a sheet-like member 10 provided on the outer surface of the bag body 3, and an extraction material enclosed in the bag body 3, and is sealed with the extraction material. The state of the bag body 3 is for extraction. The bag body 3 is a flat bag having two opposing sides, and a holding portion 11 protruding or protruding from the upper edge 3 a of the bag body 3 or the outer surfaces 3 x and 3 y of the bag body 3 is formed on the thin plate member 10 . The stiffness and softness of the water filter sheet (JIS L 1913: 2010 41.5° cantilever method (ISO (International Organization for Standardization: International Organization for Standardization) method)) is 0.09 to 6.0 mN·cm.

Description

extraction bag

The present invention relates to an impregnated extraction bag.

Previously, in order to easily obtain beverages such as green tea, black tea, and oolong tea, tea bags were widely used. The tea bags were filled with tea leaves in a bag body formed of a water-permeable filter sheet, and a hanging thread was installed on the bag body. Regarding coffee, there is a widely popular drip-type extraction bag in which coffee powder is filled into a bag body made of a water-permeable filter sheet. During extraction, the bag body is opened and hot water is poured from the opening on the upper surface; however, it is also Known is a immersion-type extraction bag that is directly immersed in hot water without opening the bag body filled with coffee powder.

However, even if the immersion type coffee extraction bag is to be immersed in hot water, because the coffee powder contains carbon dioxide, it is easy for the bag body filled with coffee powder to float in the hot water, making it difficult to fully extract the coffee. Therefore, it is proposed to install a hook piece made of a thin plate material in advance on the side of the flat bag, that is, the bag body, and hook the hook piece to the support of the cup in such a way that the bag body filled with coffee powder does not float in hot water. The piece is embedded in the hook piece (Patent Document 1).

In addition, in the immersion-type extraction bag, in order to perform extraction efficiently, it is better to have a larger volume of the bag body immersed in hot water. However, when the bag body has a planar shape such as a flat bag, it is difficult to ensure this volume. Therefore, it has been proposed to incorporate a heat-shrinkable member into the bag body so that the volume of the bag body expands in hot water (Patent Document 2). At this time, the softness of the sheet-like material forming the bag body is not limited. In the examples, polyester spunbond (weight per unit area: 30 g/m ² , rigidity A method of JIS L 1096 (45° The rigidity of the cantilever method is 65 mm).

On the other hand, in order to provide a soft touch or shape retention to the bag body made of polyester fiber, a test piece has been proposed that has the stiffness and softness measured by the A method (45° cantilever method) of JIS L 1096. The moving distance is 35 to 45% of the length of the test piece, and a rigid and soft filter material forms the bag body (Patent Document 3). Moreover, in this embodiment, the shape retention of the tetrahedral bag body before and after extraction is good. [Prior technical literature] [Patent Document]

Patent Document 1: Japanese Utility Model Registration No. 3140084 Patent Document 2: Japanese Patent Application Publication No. Sho 62-220461 Patent Document 3: Japanese Patent Application Laid-Open No. 2000-118561

[Problem to be solved by the invention]

According to the extraction bag described in Patent Document 1, the hook piece can be hooked on the cup and the bag body can be immersed in hot water. However, when only the hook piece is hooked on the cup, the extraction efficiency is low, especially because the bag body is a flat bag. , so it is difficult to obtain the desired concentration of extract in a short time. That is, if the shape of the bag body is a flat bag, although the manufacturing cost of the extraction bag can be reduced, compared with the case of a three-dimensional shape such as a tetrahedral shape, the space within the bag body where the extraction material can move is narrower. Therefore, the extraction efficiency is low. On the other hand, if a member that undergoes thermal shrinkage change is provided as described in Patent Document 2, the manufacturing steps of the extraction bag will become complicated and the manufacturing cost will increase.

Therefore, an object of the present invention is to provide an immersion-type extraction bag in which a planar bag body such as a flat bag made of a water-permeable filter sheet is filled with an extraction material, and to provide a specific grip formed on the bag body with a thin plate-shaped material. part, and define the characteristics of the water-passable filter sheet to improve extraction efficiency.

Furthermore, in Patent Document 3, it is proposed that the filter material forming the bag body has a stiffness within a specific range using the stiffness A method (45° cantilever method) of JIS L 1096, but this is only based on the improvement. The soft texture or the shape retention of three-dimensional shapes such as the tetrahedral shape of the bag body was studied on flat fabrics. The ratio of the moving length of the test piece measured by the 45° cantilever method to the length of the test piece was not based on flat fabrics such as flat bags. To improve the extraction efficiency of the bag body, study the rigidity and softness of the filter material. That is, it is considered that the characteristics of the filter material suitable for ensuring the volume of the bag body in hot water are different when the shape of the bag body before filling with the extraction material is a flat bag or other planar shape or a three-dimensional shape such as a tetrahedron. In Patent Document 3, when the bag body is in a flat shape such as a flat bag, the relationship between the characteristics of the filter material and the extraction efficiency is not studied. [Technical means to solve problems]

The inventor discovered that an extraction bag has a bag body formed of a water-permeable filterable sheet, a thin plate-shaped member provided on the outer surface of the bag body, and an extraction material enclosed in the bag body, and is sealed with the extraction material When the bag body is used for extraction, and the bag body is a flat bag with two opposing sides, the bag body can be extracted up and down with respect to the hot water surface. It is preferable to form an expandable bag with a thin plate-like member. The holding portion of the internal space of the main body is used as a water-passing filtering sheet with specific rigidity and softness to improve the extraction efficiency, thereby completing the present invention.

That is, the present invention provides an extraction bag, which has a bag body formed of a water-permeable filter sheet, a thin plate-shaped member provided on the outer surface of the bag body, and an extraction material enclosed in the bag body, and is filled with the extraction material Closed in the bag body for extraction; and The bag body is a flat bag with two opposite sides; A holding portion protruding or protruding from the upper edge of the bag body or the outer surface of the bag body is formed on the thin plate-like member; The stiffness and softness of the water filter sheet (JIS L 1913: 2010 41.5° cantilever method (ISO method)) is 0.09 to 6.0 mN・cm. [Effects of the invention]

According to the extraction bag of the present invention, since the holding portion protruding or protruding from the upper edge of the bag body or the outer surface of the bag body can be grasped, even in a situation where the bag body is likely to float from cold or hot water depending on the type of extraction material. , you can also hold the handle part so that the bag body moves up and down relative to cold or hot water to promote extraction. In particular, although the extraction material is enclosed in the bag body, the volume of the extraction material is small. Therefore, in the state where no specific holding part is provided, the two opposing sides of the bag body are close to each other, and the internal space of the bag body is small. Even if there is less hot or cold water flowing into the bag body during extraction, it can be improved by arranging a specific gripping part that protrudes from the top of the bag body so that the internal space of the bag body is increased. Extraction efficiency.

In addition, according to the extraction bag of the present invention, since the stiffness and softness of the water-permeable filter sheet forming the bag body is within a specific range according to the 41.5° cantilever method (ISO method) of JIS L 1913:2010, the extraction efficiency can be improved. Obtain the desired concentration of extract in a shorter time.

In addition, since the bag body used in the extraction bag of the present invention is a flat bag, it can be manufactured at low cost by an industrial production line.

Hereinafter, the present invention will be described in detail with reference to the drawings. In addition, in each drawing, the same symbol indicates the same or equivalent component.

(overall composition) FIG. 1A is a top view of the extraction bag 1A according to one embodiment of the present invention, viewed from the side of the thin plate-shaped member, and FIG. 1B is a rear view thereof. In FIG. 1A , the area filled with diagonal lines represents the attachment area A between the thin plate member 10 and the bag body 3 , and the area filled with dots represents the surface of the bag body 3 . In addition, in the present invention, the attachment area A is not limited to the aspect shown in the figure.

This extraction bag 1A has a bag body 3 formed of a water-permeable filter sheet, a sheet-like member 10 provided on the outer surface of the bag body 3, and an extraction material enclosed in the bag body 3, and is sealed with the extraction material. The state of the bag body 3 is for extraction. In addition, as the extraction medium, hot water is usually used, but extraction can also be carried out with cold water or warm water.

In the present invention, the bag body is a flat bag with two opposite sides, and the bag body 3 in this embodiment is a flat bag. Here, the flat bag means that when the bag body is placed on a flat surface without being filled with extraction material, the bag body is a flat bag or a flat bag that is folded into a flat bag. Preferably, it means that the upper end of the bag body is formed by an upper edge. The top view shape of the bag body is not particularly limited and can be rectangular, circular, etc. Furthermore, you may have gussets formed by folding in on the side or bottom surfaces. In contrast, bags with three-dimensional shapes such as tetrahedron, cube, and sphere are not included in the bag body of the present invention.

In the present invention, the thin plate member 10 is formed with a holding portion 11 that protrudes or can protrude from the upper edge 3 a of the bag body 3 or the outer surface 3 x of the bag body 3 . Since the holding portion 11 is provided in the thin plate-like member 10, a cutting line or a folding line is provided in the thin plate-like member 10 as necessary.

In addition, the upper part of the bag body is open, and a hooking part made of a thin plate material is provided on the outer surface of the two opposite surfaces of the bag body. By hanging the hooking part on the cup, the outer surfaces of the bag body face each other. Stretching in the opposite direction and expanding the opening on the upper part of the bag body, and also expanding the volume of the bag body, cannot prevent the volume in the bag body from being too narrow due to the limitation of rigidity and softness, and obtain the method of the present invention that improves the extraction efficiency. Effect.

The extraction bag 1A of this embodiment is provided with a short strip-shaped holding portion 11 protruding upward from the upper edge 3 a of the bag body 3 . The gripping portion 11 is fixed to the bag body 3 by attaching one end of the gripping portion 11 to one outer surface 3x of the bag body 3 in the area A. Furthermore, the folding line L1 extends from the protruding end of the holding portion 11 toward the end attached to the bag body. The fold line L1 can be formed by punching holes, half-cutting, indentation, etc.

By folding the holding part 11 in half along the folding line L1, the holding part 11 is rigidified. Therefore, as shown in FIG. 2 , the bag body 3 can be easily pressed into and immersed in the hot water W during extraction. This makes it easy to immerse or lift the bag body 3 filled with any extraction material into the hot water W, thereby promoting extraction. In addition, the folding line L1 is formed from the protruding end of the holding part 11 to the attachment area A between the holding part 11 and the bag body 3. Therefore, by folding the holding part 11 in half along the folding line L1, the upper part of the bag body 3 is partially bent. Increase the internal space of the initially flat bag body. This increases the amount of hot water flowing into the bag body and improves extraction efficiency. In addition, a thin plate-shaped member is not provided on the other outer surface 3y of the bag body 3 (Fig. 1B).

(Extraction material) Examples of the extraction material filled in the bag body 3 include coffee powder, tea leaves such as black tea and green tea, and Kampo medicines. Generally speaking, if coffee powder is filled into the bag body 3 and is immersed in hot water, the carbon dioxide contained in the coffee powder will easily cause the bag body to float, making extraction difficult. However, according to the extraction bag 1A of this embodiment, by folding and holding the holding portion 11 in half along the fold line L1 as described above, the bag body 3 can be easily immersed in hot water or moved up and down in hot water. Therefore, various extraction materials including coffee powder are suitable as extraction materials extracted from the extraction bag 1A.

(water filter sheet) In the present invention, the water-permeable filtration sheet forming the bag body 3 has a rigidity of 0.09 to 6.0 mN·cm according to the 41.5° cantilever method (ISO method) of JIS L 1913: 2010 described below, and the preferred one is 0.1～2.5 mN·cm. This allows for more efficient extraction. Here, the stiffness and softness are calculated by the following formula (1).

[Number 1] Hardness and softness

In the formula, m is the weight per unit area of the test piece, that is, the mass per unit area [g/m ² ]. C is the bending length (cm). The bending length C is half the length of the test piece protruding from the horizontal plane (protrusion length) measured by a cantilever tester with an incline of 41.5°. In addition, this formula rounds the acceleration due to gravity to 10 m/sec ² .

In addition, in the 45° cantilever method used in Patent Document 2 and Patent Document 3, the inclination of the cantilever tester is 45°, and the length (mm) of the test piece protruding from the horizontal plane is regarded as the stiffness.

Generally speaking, the rigidity in the flow direction (MD direction) during the manufacturing process of nonwoven fabrics is greater than the rigidity in the direction orthogonal to it (CD direction). In the case where the stiffness and softness of the water-permeable filtration sheet used in the present invention are different in the MD direction and the CD direction, the stiffness and softness of the water-permeable filtration sheet in the direction with higher stiffness is to satisfy the above-mentioned requirements of the present invention. the definer.

The bag body filled with the extraction material, that is, the water-permeable filtration sheet forming the bag body, is compared between two bag bodies with different stiffness and softness. The bag body with lower stiffness and softness is shown in Figure 3A. The bag body The thickness t of 3 becomes thicker, the volume inside the bag body 3 expands, and the amount of hot water flowing into the bag body 3 increases during extraction. In contrast, the bag body with higher rigidity and softness is as shown in Figure 3B. Compared with the low case, the thickness t of the bag body 3 becomes thinner, the volume inside the bag body 3 becomes smaller, the amount of hot water flowing into the bag body 3 during extraction becomes smaller, and the extraction efficiency is likely to decrease. Therefore, if the hardness and softness are too high, the concentration of the extraction liquid obtained by the specific extraction operation will become low as shown in the examples described below.

On the other hand, if the rigidity of the water-permeable filter sheet is too low, the bag body 3 filled with the extraction material is temporarily immersed in hot water, and when it is lifted, the water-permeable filter sheet will be removed as shown in Figure 4B Close to the extraction material, or the water-permeable filtration sheets on the front and back of the bag body 3 are in contact with each other, making the volume inside the bag body 3 smaller. This state will still exist even if the bag body is immersed in hot water again, and will occur. The problem of reduced activity of extraction materials inside the bag body. In addition, if the stiffness and softness are too low, the suitability for the filling and packaging machine used in the industrial production of extraction bags will be reduced.

In contrast, if the water-permeable filter sheet has appropriate rigidity and softness, as shown in Figure 4A, when the bag body 3 is immersed in hot water, the extraction material will fly in the bag body 3, promoting extraction.

In addition, the above-mentioned problems caused by low rigidity and softness can sometimes be alleviated by utilizing the rigidity of thin plate-shaped members. For example, when the stiffness and softness of the water-permeable filter sheet are different in the MD direction and the CD direction, by extending the attachment area A of the thin plate-shaped member and the bag body in the CD direction, the stiffness and softness in the CD direction can be adjusted. The problem caused by the low density relative to the MD direction is reduced by utilizing the rigidity of the thin plate-like member.

As can be seen from the above formula (1), the stiffness and softness depend on the weight per unit area of the water-permeable filter sheet. The preferred weight per unit area depends on the type of water-permeable filtration sheet, the type of fiber, etc., but is generally preferably 7 to 30 g/m ² .

As specific materials for the water-permeable filter sheet, various materials having water-permeability and filtration properties that can be used in the extraction of extraction materials can be used. For example, generally known water-permeable filter sheets for extracting beverages include synthetic fibers such as polyester, nylon, polyethylene, polypropylene, and vinylon, semi-synthetic fibers such as rayon, paper mulberry, Woven or non-woven fabrics of single or composite natural fibers such as Sanya, mixed paper containing Manila hemp, wood pulp, polypropylene fiber, etc., tea bag base paper and other paper types can also be used in the present invention. In view of the disposable nature of the extraction bag after use, it is preferable that the water-permeable filter sheet contains biodegradable fiber. Examples of biodegradable fibers include polylactic acid, polybutylene succinate, polyethylene succinate, and the like. Furthermore, in order to make the water-permeable filter sheet transparent so that the state of the extraction material in the bag body can be known, it is preferable to reduce the content of inorganic pigments or to exclude inorganic pigments.

In addition, as a water-permeable filtration sheet, the fiber diameter of the non-woven fabric can be made finer than that of plain fabrics and other fabrics, so the weight per unit area can be reduced with the same density. Therefore, in order to avoid powder leakage of the extraction material, make the weight per unit area smaller, and obtain a sheet with lower rigidity and softness, non-woven fabrics are preferred, especially for extraction materials that cause powder leakage problems such as coffee powder. Preferably non-woven fabric. When using a nonwoven fabric as a water-permeable filter sheet, spunbond nonwoven fabrics, meltblown nonwoven fabrics, or a laminate in which these are laminated can be preferably used. In particular, when obtaining a nonwoven fabric with low stiffness and softness, melt-blown nonwoven fabrics of polypropylene are preferred because it is easy to obtain a nonwoven fabric with a smaller fiber diameter and a smaller weight per unit area. In the case of non-woven fabrics, spunbond non-woven fabrics of polyethylene terephthalate are preferred. In addition, in order to set the stiffness and softness of the nonwoven fabric to a desired value, the lamination amount of the spunbond nonwoven fabric and the meltblown nonwoven fabric can be appropriately adjusted.

In addition, compared with the case where hot water is directly injected into the extraction material in the trickling filter type extraction bag, in the extraction bag of the present invention, hot water must be supplied to the extraction material through the water-permeable filter sheet. Therefore, as long as no leakage of the extraction material occurs, For powder leakage, it is better to use a filter sheet with larger holes than the water-permeable filter used in drip filter extraction bags. For example, when coffee powder is used as the extraction material, the air permeability of the water-permeable filter sheet can be set to 130 to 600 cm ³ /cm ² /sec (JIS L 1096 air permeability method A (using Fraser type air permeability) Testing machine method)).

(thin plate member) The thin plate member 10 is preferably waterproof and can be formed by punching out thin plate materials such as cardboard and plastic sheets with resin laminated on the surface. In view of the disposability of the extraction bag 1A after use, it is preferably made of biodegradable materials such as polylactic acid, polybutylene succinate, and polyethylene succinate.

(Instructions) As a method of using the extraction bag 1A of the embodiment, first, as shown in Figure 2, fold the holding part 11 in half along the fold line L1, place the bag body 3 into a container such as a cup 100, pour hot water, hold the folded holding part 11, and If necessary, press the bag body 3 into the hot water W to immerse the bag body 3 in the hot water. If the bag body 3 in the hot water W is moved up and down by moving the holding portion 11 up and down, the hot water W will flow into and be discharged from the bag body 3 repeatedly, thereby promoting extraction. Or, place the extraction bag 1A into the cup 100 pre-injected with hot water, and similarly move the extraction bag 1A up and down to perform extraction.

Alternatively, with the bag body 3 immersed in the hot water W, the hand can release the grip 11 so that the grip 11 is supported by the inner wall of the cup 100 to place the extraction bag 1A. Extraction can be carried out during storage. At this time, you can also grasp the holding part 11 again, move the holding part 11 up and down, and move the bag body 3 up and down in the hot water to promote extraction.

Furthermore, when the extraction liquid is obtained from the extraction bag 1A in this way, according to the present invention, since the rigidity and softness of the water-permeable filter sheet is within a specific range, the extraction liquid of the desired concentration can be obtained in a shorter time.

In addition, the extraction bag 1A can be easily taken out from the cup 100 by holding the holding portion 11 .

(manufacturing method) The extraction bag 1A can be manufactured according to a well-known extraction bag manufacturing method. For example, as shown in FIG. 5 , a sheet 20 for manufacturing an extraction bag is prepared as follows: the holding part 11 is aligned with the short direction of the long water-permeable filtration sheet 21 and the long side direction of the holding part 11 . They are arranged on the water-permeable filter sheet 21 at specific intervals and attached to the area A. In Figure 5, one divided volume separated by a two-point chain line corresponds to one volume of extraction bag 1A.

By using the extraction bag manufacturing sheet 20 with a filling and packaging machine, the extraction bag 1A can be continuously manufactured. At this time, as shown in FIG. 6 , the two sides in the longitudinal direction of the extraction bag manufacturing sheet 20 are folded in a superimposed manner, and the sides in the longitudinal direction are welded to each other to form a longitudinal seal S1. This forms a cylindrical body. Next, by alternately repeating the formation of the transverse seal S2 of welding the cylindrical body along the short side direction and the filling of the extraction material into the bag body, an extraction bag 1A connected up and down with the sides of the bag body 3 can be manufactured. The extraction bag continuum is extracted and cut into individual extraction bags to obtain extraction bag 1A. Alternatively, when the transverse seal in the short side direction of the cylindrical body is formed, the fusing can be performed at the same time, and the separately cut extraction bags 1A can be continuously produced.

(changing form) The extraction bag of the present invention can obtain various variations related to the shape of the bag. For example, in order to make the circulation form of the extraction bag 1A shown in FIG. 1A more compact, as shown in the extraction bag 1B shown in FIG. The substantially overlapping position of 3a forms a folding line L2. As shown in FIG. 7B, the thin plate-shaped member 10 can be folded along the folding line L2. By individually packaging the extraction bag 1B with the thin plate member 10 folded along the fold line L2, the individually packaged extraction bag can be miniaturized.

In addition, in the extraction bag 1C shown in FIGS. 8A and 8B , the holding portion 11 can also be extended downward from the attachment area A1 of the upper end of the bag body 3 and the thin plate member 10 . The holding portion 11 also has a folding line L1 in the vertical direction of the bag body that folds the holding portion 11 in half. Pull up the handle 11 from the bag body 3 and fold the handle 11 in half along the fold line L1, thereby expanding the internal space of the bag body 3 and improving extraction efficiency. The gripping part 11 may be U-shaped as shown in the figure, or may be V-shaped, rectangular, etc.

In the present invention, the thin plate-shaped member 10 can also be formed with a reinforcing portion 12 attached to the outer surface 3x of the bag body 3 around the holding portion 11 . In this extraction bag 1C, the reinforcing part 12 extends from the upper end of the thin plate-shaped member 10 attached to the upper end of the bag body 3 along the left and right sides of the bag body 3 to the lower part of the bag body 3, and is The lower part connects the left and right reinforcing parts 12. In this way, by extending the reinforcing part 12 from the upper edge 3a of the outer surface 3x of the bag body 3 to the lower part, even if the bag body 3 is filled with an extraction material such as coffee powder that easily floats the bag body 3, it will be easier to extract. Immerse the bag body 3 in hot water.

Preferably, a fold line L3 is provided between the attachment area A1 of the thin plate member 10 along the upper end of the bag body 3 and the reinforcing portion 12 . Thereby, the holding part 11 can be easily pulled up from the bag body 3 as shown in FIG. 9A.

As shown in FIG. 9B , during extraction, the extraction bag 1C can also be used for extraction by hanging the handle 11 pulled up from the bag body 3 on the cup 100 in advance.

The extraction bag 1D shown in FIGS. 10A and 10B is the one in which the reinforcing part 12 is provided only on the upper part of the bag body 3 in the extraction bag 1C shown in FIGS. 9A and 9B. In FIG. 11, the extraction bag is pulled up from the bag body 3. A perspective view of the state of the holding portion 11 of the bag 1D. In the extraction bag 1C shown in Figure 8A, the left and right reinforcing parts 12 of the gripping part 11 are continuous at the lower part of the gripping part 11. However, when the reinforcing parts are provided in the present invention, the length of the reinforcing parts can be appropriately set as needed.

When the stiffness and softness of the water-permeable filter sheet forming the bag body 3 is not too large, as shown in this extraction bag 1D, the reinforcing part 12 is provided only on the upper part of the bag body 3, thereby making the reinforcing part 12 separate from the bag body. When the upper part of 3 extends to the lower part, the thickness of the bag body 3 is easily increased by the extraction material enclosed in the bag body 3, and the internal space of the bag body 3 is expanded, which can easily promote extraction.

As shown in the extraction bag 1E shown in FIGS. 12A and 12B , a thin plate-shaped member 10 spanning one outer surface 3x and the other outer surface 3y of the bag body 3 may also be provided. Figure 13 is an expanded view of the extraction bag 1E. In this extraction bag 1E, the portion where the thin plate-shaped member 10 overlaps the upper edge 3a of the bag body 3 is folded in half along the folding line L4. The thin plate member 10 has a central attachment portion 13 attached to the bag body 3 at a central portion of one outer surface 3x of the bag body 3 . In addition, on the left and right sides of the central attachment portion 13, as the holding portion 11, there is a pair of long areas spanning both one side outer surface and the other side outer surface of the bag body 3. Since the holding portion 11 including the elongated area can be pulled up from the side of the bag body, the thin plate member 10 has folding lines L5 ₁ , L5 ₂ , and L5 ₃ in the up and down directions of the bag body. In addition, on the other outer surface 3y of the bag body 3, between a pair of long areas forming the holding portion 11, there is provided a central upper end portion 14 that is not attached to the bag body 3, and an upper end portion 14 extending from the center via the fold line L6 The upper end 14 extends to a central lifting portion 15 . A part 15A of the central lifting portion 15 is attached to the bag body 3 .

When using the extraction bag 1E, first pull up the handle 11 from the outer surface of the other side, and then pull up the handle 11 from the side of the bag body along the fold lines L5 ₁ , L5 ₂ , and L5 ₃ , thereby setting it as shown in Figure 14A and the form shown in Figure 14B. According to this extraction bag 1E, the gripping portion 11 is pulled up from the other outer surface 3y, whereby the attachment area 15A of the central lifting portion 15 to the bag body 3 is lifted in the direction of the upper edge 3a of the bag body 3, and the bag body 3 It becomes a curved shape from a flat shape to increase the internal volume and improve extraction efficiency. Furthermore, by extending the gripping portion 11 from the left and right of the central attachment portion 13 along the folding lines L5 ₁ , L5 ₂ , and L5 ₃ , the gripping portion 11 becomes rigid, making it easier to move the bag body 3 up and down in the hot water. Furthermore, because the water-permeable filter sheet has specific rigidity and softness, the extraction efficiency is further improved.

As shown in Figure 15A and Figure 15B, the extraction bag 1F can also be provided with thin plate-shaped members 10 attached to the bag body along the upper edge 3a of the bag body 3 on the two opposite outer surfaces 3x and 3y of the bag body 3. 3. The upper edge portion 17 and the handle portion 11 that can be pulled up from the upper edge portion 17 along the fold line L7 are provided with reinforcing portions 12 extending from the upper edge portion 17 on the left and right sides of the handle portion 11. In the extraction bag 1F, as shown in Figure 16, the gripping parts 11 on the outer surfaces 3x and 3y of the bag body are pulled up, and the gripping parts 11 are fastened to each other with the grooves 16a, 16b, thereby making the gripping parts 11 Rigidization makes it easier to move the bag body 3 up and down relative to the hot water.

In addition, this extraction bag 1F has a gusset 4 at the bottom of the bag body 3 in which the water-permeable filter sheet is folded inward. Therefore, as shown in Figure 16, when the gripping portion 11 on the outer surfaces of the two opposing surfaces of the bag body 3 is pulled up to stand the extraction bag 1F, the folded gusset 4 expands and the internal space of the bag body increases. , combined with the specific rigidity and softness of the water-passing filter sheet, improves extraction efficiency.

In addition, an L-shaped hooking piece 18 connected to the handle 11 along the fold line L8 is provided at the base of the handle 11 on one side outer surface 3y of the extraction bag. As shown in Figure 16, if the hooking piece 18 is pulled up along the fold line L8 with the handle 11 pulled up, the hooking piece 18 can be hooked on the cup, and the extraction bag 1F is placed in the hot water in the cup. Extraction is carried out during the period.

In the extraction bag 1G shown in FIG. 17 , the thin plate-like member 10 is attached only to one outer surface 3x of the two opposing outer surfaces of the flat bag, that is, the bag body 3, and the thin plate-like member 10 is formed There are a pair of gripping parts 11a and 11b. The pair of holding parts 11a and 11b can protrude from the outer surface 3x of the bag body by being folded along the folding line L9. In addition, grooves 19a and 19b that can engage with each other are formed in the gripping parts 11a and 11b.

When the extraction bag 1G pulls up the pair of gripping parts 11a and 11b to engage the grooves 19a and 19b, and lifts the outer surface of the bag body 3 horizontally, the bag can easily be lifted by the dead weight of the extraction material in the bag body 3. The two opposite sides of the body 3 are separated to expand the internal space. Figure 18 is a perspective view of a state in which the extraction material is extracted in the hot water W of the cup 100, with one pair of gripping parts 11a and 11b of the extraction bag 1G pulled up and the grooves 19a and 19b engaged. As shown in the figure, according to the extraction bag 1G, the bag body 3 expands horizontally in a state of initially floating in hot water, and the extraction material in the bag body 3 also expands in the horizontal direction of the bag body 3 . Furthermore, according to the present invention, since the stiffness and softness of the water-permeable filter sheet forming the bag body 3 is maintained within a specific range, the gap between the water-permeable filter sheets on the front and back of the bag body 3 is not excessively narrowed. It is easy to secure a large capacity to the bag body. Therefore, by holding the holding parts 11a and 11b and moving the bag body 3 up and down with respect to the hot water W, the extraction liquid of the desired concentration can be quickly obtained. Alternatively, with the bag body 3 immersed in hot water W, you can release the handles 11a and 11b and leave it temporarily, and then hold the handles 11a and 11b and lift it from the hot water surface.

In addition, the above-mentioned modifications of the present invention can be combined appropriately. [Example]

Hereinafter, the present invention will be explained in detail through examples.

Examples 1 to 8, Comparative Examples 1 to 4 (Preparation of extraction bag) The bag body was made into a flat bag (length 9 cm x width 6.4 cm) made of the nonwoven fabric shown in Table 1, and a thin plate-like member having a shape shown in Fig. 8A was attached to the bag body. Make a black tea extraction bag or coffee extraction bag by sealing 2 g of black tea leaves or 7 g of medium ground coffee powder into the bag body.

The abbreviations in Table 1 are as follows. MB: Meltblown nonwoven fabric SB: Spunbond nonwoven fabric SB+MB: Laminated body of spunbond nonwoven fabric and meltblown nonwoven fabric PP: polypropylene PET: polyethylene terephthalate PLA: polylactic acid

The stiffness and softness of the nonwoven fabric forming the bag body is calculated from the above formula (1) in accordance with the 41.5° cantilever method (ISO method) of JIS L 1913:2010.

In addition, the "protrusion length" in Table 1 is the length of the test piece protruding from the horizontal plane measured by a cantilever tester with an incline of 41.5°, and 1/2 of the "protrusion length" is the bend used in the calculation of equation (1) Length C.

As a test piece, a water-permeable filter sheet cut into a short strip shape (19×2.5 cm) before being formed into a bag body was used. At this time, the longitudinal direction of the test piece was set as the MD direction of the water-permeable filtration sheet, and three test pieces were extracted from each water-permeable filtration sheet. The back sides of each test piece were reversed, and the protrusion length was measured. The protrusion length of each water-passable filter sheet was measured six times, and the average value was recorded in Table 1. Furthermore, the bag body is produced so that the MD direction of the water-permeable filter sheet becomes the width direction of the bag body.

Regarding the produced black tea extraction bag and coffee extraction bag, perform the extraction operation described below and evaluate the extraction results.

(Extraction operation of black tea extraction bag) Pinch the handle of the black tea extraction bag prepared in Examples and Comparative Examples with your fingers, immerse it in a beaker containing 150 ml of 15°C water for 2 seconds, then lift it from the water surface, immerse it again after 1 second, and repeat the above immersion , Lifting operation, and perform 5, 10, 15, 30 or 45 times of dipping and lifting. The concentration of the extract obtained in the beaker when the lifting operation is performed is visually observed according to Figure 19 and shown below. The evaluation criteria are based on five stages from 1 to 5.

Black tea extract concentration evaluation standards 1: Almost no coloring 2: slightly colored 3: light red brown 4: Slightly lighter brown color 5: Normal concentration of black tea color

In addition, in this extraction operation, in order to easily grasp the concentration difference of the extraction liquid in the extraction bag of each example and comparative example, the beaker was not filled with hot water, but cold water with a temperature of 15°C was filled as mentioned above. , and the number of dipping and lifting operations is set to be greater than when the black tea for drinking is contained.

The results are shown in Table 1. Moreover, FIG. 20A and FIG. 20B show the relationship between the hardness and softness and the concentration evaluation value of the extraction liquid. Here, Figure 20B is an enlarged view of the area in Figure 20A where the stiffness and softness are 0.6 mN·cm or less.

When the number of dipping and lifting operations is 5 and 10 times, the impact of hardness and softness on the concentration evaluation value of the extract is not obvious. However, when the number of dipping and lifting operations is 15, 30 and 45 times, the impact of hardness and softness on the concentration evaluation value of the extract is not obvious. degree affects the concentration evaluation value of the extract. That is, as shown in FIG. 20A , when the hardness and softness exceeds 6.0 mN·cm, the extraction concentration decreases, and as shown in FIG. 20B , even when the hardness and softness is less than 0.09 mN·cm, the extraction concentration decreases. In contrast, it can be seen that in the range of hardness and softness of 0.09 to 6.0 mN·cm, the extraction concentration is high and stable for each number of immersing and lifting times.

(Extraction operation of coffee extraction bag) Repeat the dipping and lifting operations in the same way as the black tea extraction bag. When performing 2, 4, 6, 8 or 10 dipping and lifting operations, click on the concentration of the extract obtained in the beaker and visually inspect it. Observe and evaluate based on the evaluation criteria shown in Figure 21 and below, in stages 1 to 5.

However, because coffee is more difficult to extract than black tea, hot water at a temperature of 98°C is put into the beaker instead of cold water. In addition, the number of dipping and lifting operations is set to be greater than the number of dipping and lifting operations when the coffee for drinking is contained so that the concentration difference of the extraction liquid in the extraction bag of each example and comparative example can be easily grasped.

Criteria for Evaluating the Concentration of Coffee Extracts 1: slightly colored 2: Very light brown color 3: light brown 4: Slightly lighter brown color 5: Normal concentration of coffee color

The results are shown in Table 1. In addition, FIG. 22A and FIG. 22B show the relationship between the hardness and softness and the concentration evaluation value of the extraction liquid. Here, Figure 22B is an enlarged view of the area in Figure 22A with a stiffness and softness of 0.6 mN·cm or less.

From Figure 22A, it can be seen that when the number of immersing and lifting is 6 or more times, if the hardness and softness exceed 6.0 mN·cm, the extraction concentration will decrease. On the other hand, it can be seen from Figure 22B that when the number of immersing and lifting times is 10, the stiffness and softness are 0.09 mN·cm or more, and the extraction concentration becomes higher than when the number of immersing and lifting is 2 times. At 4, 6, and 8 times, the hardness and softness are 0.5 mN·cm or more, and the extraction concentration becomes higher.

[Table 1]

1A: Extraction bag 1B: Extraction bag 1C: Extraction bag 1D: Extraction bag 1E: Extraction bag 1F: Extraction bag 1G: Extraction bag 3: Bag body 3a: The upper edge of the bag body 3x: The outer surface of the bag body 3y: The outside surface of the bag body Outer surface 4: Gusset 10: Thin plate member 11: Grip portion 11a: Grip portion 11b: Grip portion 12: Reinforcement portion 13: Center attachment portion 14: Center upper end portion 15: Center lift portion 15A: Center lift portion and Bag body attachment area 16a: Groove 16b: Groove 17: Upper edge 18: Hook piece 19a: Groove 19b: Groove 20: Extraction bag manufacturing sheet 21: Water filterable sheet 100: Cup A: Attachment area A1: Attachment area C: Bend length L1: Polyline L2: Polyline L3: Polyline L4: Polyline L5 1: Polyline L5 ₂ : Polyline L5 ₃ : Polyline _L6 : Polyline L7: Polyline L8: Polyline L9: Polyline S1: Longitudinal seal S2: Horizontal seal t: Thickness W: Hot water

Figure 1A is a top view of the extraction bag 1A of the embodiment. Figure 1B is a rear view of the extraction bag 1A of the embodiment. FIG. 2 is a perspective view of the state of extraction using the extraction bag 1A of the embodiment. Figure 3A is a cross-sectional view of the extraction bag when the rigidity of the water-permeable filter sheet is low. Figure 3B is a cross-sectional view of the extraction bag when the rigidity of the water-permeable filter sheet is relatively high. FIG. 4A is a cross-sectional view of the extraction bag 1A of the embodiment when immersed in hot water. Figure 4B is a cross-sectional view of an extraction bag with a water-permeable filter sheet having too low rigidity and softness that is immersed in hot water and then lifted up from the hot water. Figure 5 is a top view of the sheet used for manufacturing extraction bags. Figure 6 is an explanatory diagram of the manufacturing method of the extraction bag. Figure 7A is a top view of the extraction bag 1B of the embodiment. FIG. 7B is a top view of the extraction bag 1B of the embodiment in a state where the grip portion is stacked. Figure 8A is a top view of the extraction bag 1C of the embodiment. Figure 8B is a rear view of the extraction bag 1C of the embodiment. FIG. 9A is a perspective view of the extraction bag 1C according to the embodiment with the handle portion pulled up. FIG. 9B is a perspective view of the extraction bag 1C of the embodiment in a state for extraction. Figure 10A is a top view of the extraction bag 1D of the embodiment. Figure 10B is a rear view of the extraction bag 1D of the embodiment. Figure 11 is a perspective view of the extraction bag 1D of the embodiment with the handle portion pulled up. Figure 12A is a top view of the extraction bag 1E of the embodiment. Figure 12B is a rear view of the extraction bag 1E of the embodiment. Figure 13 is an expanded view of the extraction bag 1E of the embodiment. Figure 14A is a perspective view of the extraction bag 1E of the embodiment with the handle portion pulled up. FIG. 14B is a perspective view of the extraction bag 1E of the embodiment with the handle portion pulled up. Figure 15A is a top view of the extraction bag 1F of the embodiment. Figure 15B is a rear view of the extraction bag 1F of the embodiment. Fig. 16 is a perspective view of the extraction bag 1F according to the embodiment with the handle portion pulled up. Figure 17 is a top view of the extraction bag 1G of the embodiment. Figure 18 is a perspective view of the extraction bag 1G of the embodiment for extraction. Figure 19 is the evaluation standard for the concentration of the extract liquid in the black tea extraction bag. Figure 20A is a graph showing the relationship between the hardness and softness of the black tea extraction bag and the concentration evaluation value of the extraction solution. Figure 20B is an enlarged view of the relationship diagram shown in Figure 20A when the stiffness and softness are below 0.6 mN·cm. Figure 21 is the evaluation standard for the concentration of the extract liquid in coffee extraction bags. Figure 22A is a graph showing the relationship between the hardness and softness of the coffee extraction bag and the concentration evaluation value of the extraction liquid. Figure 22B is an enlarged view of the relationship diagram shown in Figure 22A when the stiffness and softness are below 0.6 mN·cm.

1A: Extraction bag

3: Bag body

11:Control Department

100: cup

L1: polyline

W: hot water

Claims (10)

An extraction bag, which has a bag body formed of a water-permeable filterable sheet, a thin plate-shaped member provided on the outer surface of the bag body, and an extraction material enclosed in the bag body, and the extraction material is sealed in the bag body in a state ready for extraction; and The bag body is a flat bag with two opposite sides; A holding portion protruding or protruding from the upper edge of the bag body or the outer surface of the bag body is formed on the thin plate-like member; The stiffness and softness of the water filter sheet (JIS L 1913: 2010 41.5° cantilever method (ISO method)) is 0.09 to 6.0 mN・cm. The extraction bag of claim 1, wherein one end of the handle in the longitudinal direction is attached to the outer surface of the bag body, and the fold line extends from the end of the other side toward the end of the aforementioned side, and when folding the The folding line increases the internal space of the bag body with the handle protruding from the upper edge of the bag body. The extraction bag of claim 1, wherein a thin plate-like member is attached to the outer surface of one of the two opposing sides of the bag body, and the thin plate-like member has a pair of gripping parts that can be pulled up from the outer surface, and a pair of The handles can snap together. The extraction bag according to any one of claims 1 to 3, wherein the water-permeable filter sheet is spunbond nonwoven fabric, meltblown nonwoven fabric, or a laminated nonwoven fabric of spunbond nonwoven fabric and meltblown nonwoven fabric. The extraction bag according to any one of claims 1 to 3, wherein the unit area weight of the water-permeable filter sheet is 7 to 30 g/m ² . For example, in the extraction bag of claim 4, the weight per unit area of the water-permeable filter sheet is 7 to 30 g/m ² . The extraction bag as claimed in any one of items 1 to 3, wherein the extraction material is coffee powder or tea leaves. For example, the extraction bag of claim 4, wherein the extraction material is coffee powder or tea leaves. For example, the extraction bag of claim 5, wherein the extraction material is coffee powder or tea leaves. For example, the extraction bag of claim 6, wherein the extraction material is coffee powder or tea leaves.